Teac V-870 - Mechanical Adjustments and Checks; Pinch Roller Pressure Measurement; Tape Path Adjustment

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4. MECHANICAL ADJUSTMENTS AND CHECKS
GAB DAME CHEER
4-1 PINCH ROLLER PRESSURE
1. Press the cassette switch (see Fig. 3-1) up to set dhe deck ta
the playback mode.
The cassette switch should be pressed up throughout measure-
ment,
. Hang the spring scale from the pinch roller arm,
3. Extend the spring in the direction shown in the figure watil
the rotation of the pinch roller stops, then return it gradually
so that the pinch roller cames into contact with the capsten
shaft again.
4, Read the value at the moment the pinch roller starts rotating.
Standard values
Take-up side
Supply side
ho
390 g — 490 g (13.8 oz — 17.3 oz}
170 g — 230 g (6.0 oz — 8.1 02)
Supply side
TS
4-1 EwrFea— SRD
1 ARYh. Rt F (FIO. $1 BRR) BEAICHUTSY
4+E~KEGS,
HER, AvVYb- Zt Y FIG LAICHUBU STE.
2, CYR +O-D- P-ACARREENTS.
3. Bee vs- O-DOREAILESE CHROAMCEROK .
&, CyF-o- PRCT ame vay helenae
KORACI.
4, ¢yvF+oO- SHOOMHSLEOWERE,
RBI FL7PYTH 390 g ~ 490 9
HTS4IH 178 g ~ 230 9
Take-up side
T4AIF YT H
Fig. 4-1 Pinch roller pressure measurement EY F-O—- 3 ci A -
4-2. TAPE PATH ADJUSTMENT -
Note: The following special tools and tapes are required for this
section.
Head check jig A (P/N 5736006600)
Head check jig B (P/N 5736006700)
MTT-150 test tape (for Dalby level calibration)
MTT-356 (or MTT-256} test tape (for frequency response
check)
MTT-902 mirror tape {0-90 type)
DECK
undar TEST
R
OUTPUT AC Voltmeter
Fig. 4-2 Test setup for azimuth adjustment
PYUVARBBRG
4-2 F—-PHRTMWE
HE COMBEITSIROICAADNBR, FAR:
TH.
Av FiBRA (P/N: 5736006600)
Aw PAB (P/N: 5736006700)
MTT-150 FAR+7T—-DCRILE—:
MTT-356 (KIKMTT-256) TAR:
=A)
MTT-902 = 3—
F— PALE
PAIL: Gy bh AD
TT FEB RE
—F (C-908)
Oo
O° (in phase) 45° 90° ~—S-135°—- 180" (out of phase)
Ti e468 aa
PAOD SE
Fig. 4-3. Confirming phase relationship
AB RTH